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PosiTest Manual Adhesion Tester by DeFelsko

POSITEST AT-M MANUAL ADHESION TESTER by DeFelsko measures coating adhesion on a variety of substrates. The heavy-duty manual hydraulic pump is designed to apply smooth and continuous pull-off pressure with a single stroke. Pull-off pressure is displayed in psi or MPa on a large digital indicator. The PosiTest AT-M Manual Adhesion Tester features self-aligning dollies for reliable pulls on uneven surfaces, and pull-rate indicator for greater accuracy and conformance to international standards.

The PosiTest AT-M Manual Adhesion Tester is now available in four kits:

ATM20 - 20 mm stand-off and dollies

ATM50 - 50 mm stand-off and regular dollies

ATM50T - 50 x 50 mm stand-off and pull plates & posts for testing cementitious adhesives for tiles, in accordance with BS EN 12004-2: Adhesives for Ceramic Tiles; Test Methods

ATM50C - 50 mm stand-off and dollies for testing concrete surfaces and overlays, in accordance with ASTM C1583: Standard Test Method for Tensile Strength of Concrete Surfaces and the Bond Strength or Tensile Strength of Concrete Repair and Overlay Materials by Direct Tension

In addition, Conversion Kits are available for all dolly types: 20 mm, 50 mm low bond-strength, 50 x 50 mm Tile Conversion Kit, and 50 mm C1583 Conversion Kit. The addition of any conversion kit to the allows the PosiTest AT-M to be used in a broad range of applications.

PosiTest Manual Adhesion Tester comes with a rechargeable NiMh battery. In addition, both models of PosiTest Adhesion Testers are rated for water and dust ingress protection to IP 65.

An optional 50 mm Accessory Kit is available for adhesion testing of lower bond-strength finishes, including coatings on wood, concrete, and plastic. For 0 - 500 psi range, the larger surface area of the dolly provides improved precision and repeatability.


  • Portable, hand-operated instrument requires no outside power source; ideal for lab or field use
  • Large, easy to read Digital LCD display
  • LCD displays pressure value in psi or MPa
  • Manual hydraulic pump designed to apply smooth and continuous pressure with a single stroke
  • Pull-Rate Indicator to easily monitor and manually adjust the rate of pull in accordance with international standards
  • Internal Memory stores maximum pull-off pressure, rate of pull, test duration, and dolly size for up to 200 pulls.
  • Easily select dolly sizes, change measurement units, or store readings with the touch of a button
  • Automatic calculation of pressure based on dolly size; no conversion charts required
  • Self-Aligning Dolly enables accurate measurements on smooth or uneven surfaces
  • Inexpensive, single-use dollies eliminate cleaning for re-use, and can be kept for a permanent record.
  • 10, 14, 20, or 50 mm dollies maximize capability and accuracy across a wide range of bond strengths
    • 10 mm: 10000 psi (70 MPa)
    • 14 mm: 6000 psi (40 MPa)
    • 20 mm: 3000 psi (20 MPa)
    • 50 mm: 480 psi (3.3 MPa)
    • 50x50 mm: 375 psi (2.585 MPa)
  • Manual hydraulic pump can be used in any position
  • High-grade, industrial pressure sensor ensures continued accuracy
  • Environmentally-sealed enclosure meets or exceeds IP65 - weatherproof, dustproof, & shockproof
  • rugged carrying case
  • every PosiTest Adhesion Tester pressure system is calibrated and certified to + 1% accuracy using an NIST-traceable load cell
  • PosiTest AT-M is compatible with PosiSoft Desktop software, for viewing, printing, and storing measurement data
  • Conforms to national and international standards including ASTM D4541/D7234, ISO 4624/16276-1, AS/NZS 1580.408.5 and others


Four kit options are available for the PosiTest AT-M Manual Adhesion Tester:

Order Code ATM20 ATM50 ATM50T ATM50C
Dolly Size & Stand-off 20 mm 50 mm 50 x 50 mm 50 mm
Typical Applications Higher bond-strength coatings on metal substrates Lower bond-strength coatings on wood, concrete, & plastic

Cementitious adhesives for tiles

BS EN 12004-2

Concrete surfaces and overlays

0.7 - 20 PMa
100 - 3000 psi

0.4 - 3.3 PMa
50 - 480 psi
0.4 - 2.585 MPa
50 - 375 psi
0.4 - 3.3 MPa
50 - 480 psi
Resolution 0.01 MPa /  psi
Accuracy + 1% Full Scale
Included Dollies ø20mm Qty 20
ø50 mm Qty 8
50 x 50 mm Plate Qty 4 w threaded post
ø50 mm Qty 4 w  > 25 mm thickness
Cutting Tool 20 mm hole saw 50 mm hole saw  - - 50 mm diamond grit hole saw with arbor


Each PosiTest AT-M Adhesion Tester Kit Includes:

PosiTest Manual Adhesion Tester with built-in, rechargable NiMH battery with charger, test dollies, abrasive pad, cutting tool, adhesive kit, cotton swabs, USB cable, PosiSoft Software, instructional video and instruction booklet, carrying case, Certificate of Calibration traceable to NIST, two-year warranty.





50 MM Conversion Kit (AT50KIT) interchangeable stand-off allows PosiTest ATM20 or ATA20 to pull 50 mm test dollies. Contains: 12 x 50 mm dollies, 50 mm stand-off, 50 mm hole saw.


20 MM Conversion Kit (AT20KIT) - interchangeable stand-off allows PosiTest ATM50 or ATA50 to pull 10, 14, and 20 mm dollies. Ideal for high bond-strength finishes such as coatings on metal. Contains: 20 mm stand-off, 20 mm hole saw, 20 x 20 mm aluminum test dollies.

50 mm x 50 mm Tile Conversion Kit (AT50TKIT) - Interchangeable stand-off allows a PosiTest ATM or ATA to pull 50 mm x 50 mm square dollies conforming to BS EN 12004-2. Ideal for measuring the tensile strength of ceramic tile cementitious, dispersion and reaction resin adhesives. Contains: 50 mm x 50 mm steel dollies (4), and 50 mm x 50 mm stand-off.

50 mm C1583 Conversion Kit (AT50CKIT) - Interchangeable stand-off allows a PosiTest ATM or ATA to pull 50 mm dollies conforming to ASTM C1583. Ideal for measuring the tensile strength of concrete surfaces, and concrete repairs and overlay materials. Contains: Includes 50 mm C1583 steel dollies (4), 50 mm diamond grit cutting tool with arbor and 50 mm C1583 stand-off. ** A drill is required, and is not included in this kit.


Optional AT-M Accessories:

  • Drilling template and drill bits for 50 mm dollies - ideal for thicker coatings on concrete.
  • PosiSoft Software


  • Additional dollies:

    • 20 mm (use on metal substrates; packs of 10 or 100)
    • 50 mm (use on soft substrates, like concrete; packs of 5 or 50)
    • 10 or 14 mm (use on steel substrates for higher pull-off pressures; packs of 10 or 100)
    • 50 x 50 mm Tile dollies (post & plate)
    • 50 mm C1583 dollies

To view Instructional Video for the PosiTest Adhesion Tester, please click here

Please click to download the product data sheet for the PosiTest AT-M


Stone Tucker Instruments is able to re-certify your PosiTest Manual Adhesion Tester

PosiTest Adhesion Test Self-Alignment Feature-211-1191787261.pdf
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